It was necessary to decouple code handling writing to sysfs from the one
responsible for setting PWM of the fan.
Due to that, new __set_pwm() method was extracted, which is responsible for
only setting new PWM duty cycle.
Signed-off-by: NLukasz Majewski <l.majewski@samsung.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>